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Britney Spears was a major fan of Katy Perry's denim dress at the MTV Video Music Awards that harkened back to Spears and then-boyfriend Justin Timberlake's classic 2001 double all-jean ensemble.

"@katyperry Just when I thought the denim dress had retired....you bring it back! You looked amazing tonight bb ;)," Spears tweeted early Monday, responding to Perry's tweet that said: "@britneyspears I did my best impression, hope u likey!"

At Sunday's awards show, Perry also had a denim-clad guy on her arm: rapper Riff Raff, who collaborated with her on the tune "This Is How We Do." Riff Raff's suit and Perry's strapless dress, which featured a sultry slit, were both made by Versace.

Spears and Timberlake wore their matching looks to the 2001 American Music Awards.

Julie Gordon is the entertainment and style editor at amNewYork, specializing in all things pop culture, celebrity news and fashion. Her work has also appeared in publications including BusinessWeek, Newsday and USA Today. She is a proud alum of The George Washington University.